New in Symfony 2.7: PHPUnit Bridge

In computer science, the bridge pattern is meant to "decouple an abstraction
from its implementation so that the two can vary independently". The bridge uses
encapsulation, aggregation and can use inheritance to separate responsibilities
into different classes.

Symfony defines several bridges to abstract third-party libraries such as Doctrine,
Monolog, Swiftmailer and Twig. In Symfony 2.7 we added a new bridge for PHPUnit.
This first version of the bridge provides the following features:

It reports a summary of deprecation notices at the end of the test suite.

The last feature is very useful for Symfony developers that are preparing the
transition to Symfony 3. First, install the new PHPUnit bridge in your application
executing the following command:

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$ composer require --dev "symfony/phpunit-bridge":2.7.x@beta

Then, execute the test suite and you'll see a report of the deprecated Symfony
features that your application is still using:

By default, deprecation notices will make tests fail. This behavior can be
controlled with the SYMFONY_DEPRECATIONS_HELPER environment variable (default
value = strict). Change the value of that variable to weak to make the
bridge ignore deprecation notices. This is useful for projects that must use
deprecated interfaces for backward compatibility reasons.

In addition, you can safely mark a test as legacy using any of the following methods: